[systemd-devel] [PATCH] sd-dhcp: check for udp packets

[Umut Tezduyar Lindskog]

Do not try to parse ICMP packets
---
 src/libsystemd-network/dhcp-packet.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index bed942f..f4a6227 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -157,6 +157,11 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
 
         /* UDP */
 
+        if (packet->ip.protocol != IPPROTO_UDP) {
+                log_dhcp_client(client, "ignoring packet: packet is not UDP");
+                return -EINVAL;
+        }
+
         if (len < DHCP_IP_UDP_SIZE) {
                 log_dhcp_client(client, "ignoring packet: packet (%zu bytes) "
                                 " smaller than IP+UDP header (%u bytes)", len,
-- 
1.7.10.4